b2=6
b4=24
b2=b1*q
b4=b1*q³
b1=6/q и b1=24/q³
6/q=24/q³
6q³=24q
q²=4
1) если q= 2
b1=3
S8= (3*(1-2⁸))/(1-2)= 3*(1-256)/-1= 765
2) если q= -2
b1= -3
S8= (-3*(1-(-2)⁸))/1+2= (-3*(1-256))/1+2= 255
1) б
bn+1 = bn * q
q = b2\ b1 = -4\-2 = 2
q = 2
b1 = -2
b2 = -4
b3 = -8
b4 = -8 * 2 = -16
b5 = -16 * 2 = -32
b6 = -32 * 2 = -64
b7 = -64 * 2 = -128
b 8 = -128 * 2 = -256
b9 = -256 * 2 = -512
Sn = b1 (q^n−1) \ q−1
S9 = -2( 2^9-1) \ 2 - 1
S9 = -1022
b2=6
b4=24
b2=b1*q
b4=b1*q³
b1=6/q и b1=24/q³
6/q=24/q³
6q³=24q
q²=4
1) если q= 2
b1=3
S8= (3*(1-2⁸))/(1-2)= 3*(1-256)/-1= 765
2) если q= -2
b1= -3
S8= (-3*(1-(-2)⁸))/1+2= (-3*(1-256))/1+2= 255